The days of product codes being a primary activation method for Sygic ended in 2021. Since then, Sygic transitioned to a subscription-based model with its Premium+ service. As officially stated by Sygic, "Sygic stopped selling licenses with product codes in 2021. All purchases since 2021 are activated by signing in in the app with an account".
Sygic uses server-side verification for its licenses. Even if a fake key temporarily works, your account can be permanently banned when the system detects the fraud [3]. Legitimate Ways to Get Sygic Premium sygic premium key generator